GoogleTest

Google Benchmark is a C++ microbenchmark support library for measuring the runtime of code snippets, including operations and data-structure changes during performance optimization. Benchmarks are written as functions that perform setup, execute the code under timing inside a `benchmark::State` loop, and are registered and run through the library's benchmark and `BENCHMARK_MAIN` APIs. It can be used with C++11, requires C++17 to build, and is built with CMake; Google Test is required for building and running its tests unless those tests are disabled.

Catch2 is an open-source, C++-native unit testing framework for unit tests, test-driven development (TDD), and behavior-driven development (BDD). It uses readable test names, assertions written as ordinary C++ boolean expressions, and sections for localized sharing of setup and teardown code. It also provides simple BDD macros and basic microbenchmarking; benchmarks are opt-in rather than run by default. Catch2 v3 is distributed as a normal library with multiple headers and separately compiled implementation, while the v2.x branch provides the previous major version and C++11 support.

gstack is an open-source skill and tooling framework for Claude Code, developed by Garry Tan. It turns Claude Code into a virtual engineering team through Markdown-based slash commands and specialist roles covering product review, engineering management, design review, code review, browser-based QA, security auditing, release management, documentation, and other software-delivery tasks. Its tools can drive a real browser and support unit-test, end-to-end-test, and black-box verification loops. The repository describes 23 specialist tools and eight power tools, and distributes the project under the MIT license. It requires Claude Code, Git, and Bun; Node.js is additionally required on Windows.

Playwright is an open-source framework for web testing and browser automation, developed in the Microsoft repository. It drives Chromium, Firefox, and WebKit through a single API and includes an end-to-end test runner with isolated browser contexts, auto-waiting, web-first assertions, resilient locators, parallel execution, and reusable authentication state. Its tooling also includes a browser-automation library, CLI for coding agents, MCP server for AI-agent and LLM-driven automation, and tracing that records actions, DOM snapshots, network requests, console messages, screenshots, and videos for debugging.

Guava is a set of core Java libraries developed by Google. It adds collection types such as multimaps and multisets, immutable collections, a graph library, and utilities for concurrency, I/O, hashing, primitives, strings, and related tasks. The distribution provides separate JRE and Android flavors. The JRE flavor requires JDK 1.8 or higher; both flavors are published as Maven artifacts under the com.google.guava group ID with the guava artifact ID, and can also be added through Gradle. APIs marked with @Beta may change or be removed, while non-beta APIs are intended to remain binary-compatible.